Question

Shown is a regular pentagon, find y.

Answer 1

54 degrees

Explanation:

Every side of a regular pentagon is same.

So we have an isosceles triangle. The correspond angle of y, must equal to y (degree) too.

Also, every inner angle of a regular pentagon is 360/5=72. So we can calculate angle y, by the equation y+y+72=180.

y=54